Thanks Mathew,
It really helps a lot in understanding the workings.
Rgds,
Nishit Shah.
On 6/20/2012 6:27 AM, Vick, Matthew wrote:
(Top-posting)
Thanks for the additional data. 82574, being a newer part, has a more
efficient interrupt mechanism for the driver to use than previous
parts. The restriction on interrupts with InterruptThrottleRate
obviously helps CPU utilization, but it isn't going to be as dramatic
of a change when compared to other parts the interrupts are already
more efficient.
I'm still working to create a finalized patch that resolves both
issues you've raised.
Cheers,
Matthew
*From:*Nishit Shah [mailto:[email protected]]
*Sent:* Tuesday, June 19, 2012 5:47 AM
*To:* Vick, Matthew
*Cc:* [email protected]
*Subject:* Re: [E1000-devel] problem with simplified balancing on
82574 chips
Hi Matthew,
1.) vmstat and top output with ethtool -C <nic> rx-usecs 0 as well
as ethtool -C <nic> rx-usecs 3. (In my case both are giving me the
same results)
# vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo
in cs us sy id wa st
0 0 0 2013040 11748 5736 0 0 0 0 40644
18 0 23 77 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40736
28 0 23 77 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40730
10 0 24 76 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40731
14 0 24 76 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40735
24 0 24 76 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40732
12 0 24 76 0 0
# top output
Tasks: 41 total, 1 running, 40 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi,
0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, *52.8%id,* 0.0%wa, 1.3%hi,
*45.8%si,* 0.0%st
2.) vmstat and top output with ethtool -C <nic> rx-usecs 4
# vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo
in cs us sy id wa st
0 0 0 2012916 11804 5740 0 0 0 0 18599
20 0 23 77 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18588
14 0 22 78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18592
12 0 22 78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18591
12 0 22 78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18593
11 0 22 78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18594
12 0 23 77 0 0
# top output
Tasks: 41 total, 1 running, 40 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi,
0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, *53.3%id*, 0.0%wa, 0.3%hi,
*46.3%si*, 0.0%st
I can see a good amount of drop in interrupts in vmstat. i.e. 40600 to
18600 but I don't see much improvement in top output in terms of CPU
utilization.
Rgds,
Nishit Shah.
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
E1000-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/e1000-devel
To learn more about Intel® Ethernet, visit
http://communities.intel.com/community/wired
